Bolt-header.



210. 873,750. Y PATENTED DEC. 17, 1907.-

. 0. H. HOPKINS.

BOLT HEADER.

APPLICATION FILED FEB. 23. 1907 INVENTOR A TTORNE Y3? UNI E STATES r arnn'r FlG CHARLES HENRY HOPKINS, OF BUTLER, PENNSYLVANIA, ASSIGNO'R O1 lall TY-ONE ONE- HUNDREDTHS TO NATl OXAL HAUllINEltY (10., Oi 'lll FlN, Ol'llO.

BOLT-HEADER.

Specification of Letters Patent.

Patented Dec. 17, 1907.

Application filed February 23,1907. Serial No. 358.873.

T o all whom ii ma y concern:

Be it known that I, QHARLES HENRY I'lOP runs, a citizen cf the United States, residing at Butler, in the county of Butler and State of Pennsylvania, have invented a new and useful Boltd'leader, of which the following is a specification.

This invention relates to heading machines for bolts, rivets and the like and more particularly to an improved die for making square or hexagon head machine bolts.

In the manufacture of bolts and rivets hav ing heads of angular formation considerable difficulty has been experienced in producin a bolt having a perfect or symmetrical hea free from the flash or fin which is usually formed around-one side of the head during the upsetting process. This fin or flash is generally due to the excess or leakageof metal between the gripping dies and headign tool during compression and must be trimmed oflin another machine before the bolts are ready for use p The object of the present invention is to provide a die capable of producing a bolt or rivet the head of which is symmetrical in form and free from the objectionable flash or fin so that the bolt will not require any linishing after leaving the machine.

A further object of the invention is to provide a heading die having a tubular member or sleeve slidably mounted thereon and which in conjunction with the heading tool constitutes a matrix for the metal forming the head of the bolt.

A further object is to so arrange the sleeve on the heading tool that the initial longitudi nal movement of the plunger will cause the sleeve to bear against the gripping dies and a' further movement thereof actuate thehcading tool to compress the metal in the matrix without liability of the metal flashing and forming a iin or flange on the bolt head.

A still further object of the invention is to generally improve this class of machines so as to increase their utility, durability and elliciency. v

Further objects and advantages will appear in the following description, it being understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims.

In the accompanying drawings forming a part of this specification: Figure 1 is a horizontal sectional view of a portion of a bolt heading or up-setting machine provided with Similar numerals of reference indicate corresponding parts in all of the 'flguresof the drawings. The im roved' die forming the subject matter of t io present invention is princi ally designed for use in connection with boltheading machines of the single blow open die type but it'will be understood that the invention' is not limited. to this particular type of machine as the same may be used with equally good results in connection with ordinary presses or solid die machines.

In the drawings 5 designates the frame of a standard type of bolt and rivet heading machine, 6 the longitudinally movable plunger and 7 the slide carrying the movable gri ping die 8.

ecured in any suitable manner to the lunger 6 is the heading tool 9 the latter being provided with a shank 10 having an intermediate annular shoulder 1 1 defining a reduced extension 12, the face 13 of which is angular in formation and constitutes the die proper. Slidably mounted on the shank 10 is a tubular member or sleeve 14 which in conjunction withthe die 13 forms a matrix 4 for the reception oi the heated bar or blank constituting the head of the bolt. The tubular member 14 is pivotally connected with the heading tool 10 by means of parallel links 15 one end of each of which is secured to an annular flange 16 in any suitable manner as by screws or rivets 17w'hile the opposite ends of th e links are provided with elongated slots 18 for the reception ofbolts or pins 19 carried by the tubular member and extending through said slots, as shown. The interior walls of the tubular member are hollowed out to form an enlargement 20in which is seated a coiled spring 21 one end of which bears against the flange lfiwhile the opposite end thereof engages a shoulder 22 formed by the enlarge. ment 20. It will thus be seen that the nor mal tendency of the coil spring 20 is toyieldably support the 'tubularmember or sleeve 14 in advance of the die 13 so that the initial downward movement of the plunger 6 will. cause the member 14 to bear against the sta- "tionary and movable dies 8 and 23while a form a bolt-hoad without lending to squeeze further movementof the plunger will move l the die 13 to operative position against the tension of the spring 20 and thus effectually compress the metal in the matrix Without liability of the metal flashing or escaping between the dies and the tubular member and causing a fin or flange on the bolt head.

T he longitudinal movement of the heading tool is limited by the flange 11 which engages a stop shoulder 24 formed in the interior walls of the tubular member 14, as shown.

In operation. the heated bar or stock is fed into the machine against the shearing blade or knife 25 and as the slide 7 is moved. forward the movabledie 8 will grip the severed portion of the blank or stock and hold the same in alinement with the heading tool. As the plunger is moved in the direction of the work or stock the tubular member 14 will bear against the co-aeting dies and thus form a box or housing for the adjacent end of the. stock so that when the die 13 is actuated against the tension of the coiled spring the metal in the matrix will be c 1npressed and assume the form of a finished bolt head. lt will thus be seen that as the die moves forl ward to up-set the head of the bolt the llat bearing fare 26 of the tubular member will come in Contact with the gripping dies before the metal in the blank or stock has an oppori tunil to llash or form a tin between the provided l sleeve 14 and the gripping dies:

The movement 01' the dies lb and sleeve l-l isso timed that the right amount oi compression by the die 12;} is secured to romplvlcly the hot .nu'lal between the lures ot the menu ber 14 and gripping dies.

The improved die may be used to! making square and hexagon head 'marhino bolts, T head bolts, sperial lrurk bolts and for various other purposes.

llaving thus drsrribed the inrenl is claimed is:

ion what 1. In a bolt heading machine, the combination with a heading tool, of a matrix slidably mounted on the heading tool, slotted links forming a connection between the matrix and heading tool, pins seated. in. the slots of the links, and means for yieldably supporting the matrix in advance of the heading tool.

2. A heading tool forup-setting machines including a die having its side walls off set to form a laterally extending flange, a tubular member slidably mounted on the die and coaeting therewith to form. a matrix, links secured to the flange and h aving their opposite ends provided with longitudinal slots, pins carried by the tubular member and seated in said slots, and a spring interposed. between the flai'ige and tubular member for normally and yieldably holding the member in ad vanee of the die.

3. A heading tool for up-setting machines including a shank having one end thereof reduced to form a die l'iaving a solid angular face and provided with an intermediate stop shoulder, a flange extending laterally from the shank, a tubular member slidablyniounh ed on the shank and -o-acting with the die to form a matrix, said tubular member being with an enlarged chamber and an annular shoulder, a spring seated in said rhamber and having one end thereof bearing against the adjarent wall of the chamber and its opposite end engaging the flange, a pair of links earl! having one end thereof serured to the flange and its pposite end slotted, and pins rarried b the tubular member and engaging the slots in the links. 1

in testimony that l claim the foregoing as my own, l have hereto allixed my signature in the presenre of two witnesses.

(lllAltLlCtrl HENRY llOllilNh.

Witnesses:

JAMES l). M ARSHA on. J. l). MARSHALL. 

